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Finding the Fourth Proportional to 855.42, 1,179.90 and 606.74

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Solution

The fourth proportional to 855.42, 1,179.90 and 606.74 is: 836.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.42 : 1,179.90 = 606.74 : x
  2. Step 2: Convert to fraction form
    855.42/1,179.90 = 606.74/x
  3. Step 3: Cross multiply
    855.42x = 1,179.90 × 606.74
  4. Step 4: Simplify right side
    855.42x = 715,892.53
  5. Step 5: Solve for x
    x = 715,892.53/855.42
  6. Step 6: Final answer
    x = 836.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.